use rustc_hir::{ImplItem, ImplItemKind};
use rustc_lint::{LateContext, LateLintPass};
use rustc_session::{declare_lint_pass, declare_tool_lint};
+use rustc_span::sym;
use crate::utils::{
get_trait_def_id, implements_trait, is_type_diagnostic_item, paths, return_ty, span_lint_and_help,
if decl.inputs.len() == 1;
// Check if return type is String
- if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id), sym!(string_type));
+ if is_type_diagnostic_item(cx, return_ty(cx, impl_item.hir_id), sym::string_type);
// Filters instances of to_string which are required by a trait
if trait_ref_of_method(cx, impl_item.hir_id).is_none();